Installation Guide & User Manual
Contents
1. Tuning for the R7 and R 16 Receivers is determined by a single tuning coil See Figure 10 A plastic tuning wrench PLT 005 is needed to adjust the receiver tuning coil Most Williams Sound receivers including R7 s are set at the factory to 72 9 MHz Yours may have been set to another channel when they were ordered To change the frequency of R7 receivers Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 22 The receiver must be tuned under moderate or weak signal conditions Set the T4 Transmitter s RF Output Power to QUARTER See Figure 9 Play a CD or cassette through the sound system or have someone speak into a microphone Make sure the transmitter is set for the channel to which you want to tune the receiver then move 50 75 feet away from the transmitting antenna Open the battery compartment then lift up on the battery flap to open the back of the receiver This will expose the circuit board Locate the tuning coil See Figure 10 The only adjustable item in the unit the tuning coil is a small square bright metal can with a screwdriver slot in the top center Use the earphone supplied with the receiver to listen for the transmitted signal Slowly and gently rotate the tuning coil with a plastic tuning tool PLT 005 Do not press down on the coil When you find the signal transmitted by your system adjust for the loudest and clearest sound possible Re tune all the receivers marking the ne2. t hesitate to call us toll free at 1 800 843 3544 FIGURE 1 OVERALL SYSTEM DIAGRAM Microphones Loudspeakers aq e Hne Level e ooooo BH o cn 8 Line Level c 9669 o Input 74 Transmitter R7 R7 4 Receivers w Earphones Sound System Amplifier 6 wv Williams Sound Helping People Hear F A FIGURE 2 T4 TRANSMITTER CONTROLS amp FEATURES Audio Level Indicators Phones Jack Four LED array shows audio level in 6 dB steps Optimum level 1 4 jack 220 Q source impedance Drives mono or stereo is reached when the amber 0 light usually blinks and the red 6 headphone Monitors exactly what is being transmitted light blinks occasionally PPA T4 Professional FM Auditory Assistance Transmitter William Sound Vf Frequency Synthesized Channel Selectable Phones Audio Adjust Audio Level Power 7A gt amp dB 0dB 60B RF Carrier Vai sess gt Increase O O O Lo Ok Ok TooHi Power Indicator Audio Level Control RF Indicator Green LED Rotary pot screwdriver adjust Green LED indicates transmitter RF is on used with audio indicator lights Audio Select Switches Line Out DIP switch sets input characteristics audio Line level output of the fully processing mode and input filter cutoff processed as transmitted audio frequency See top panel chart or Figure 3 Can be used for monitoring recording or as a feed for other equipment i vV nuaa mput 63 Model PPA T4 Audi
3. T4 is equipped with a with a short flexible antenna ANT 021 The ANT 021 threads onto a stud recessed in a hole on the top of the transmitter Do not use excessive force to tighten the antenna it need only be finger tight The T4 Transmitter can also be purchased with a with a coaxial antenna ANT 005 or Wall Mount Dipole Antenna ANT 024 See Remote Antenna Location Tips on page 11 for more detail Choose a Channel Both the T4 Transmitter and R7 Receivers are set to 72 9 MHz at the factory unless otherwise specified However you may easily set the T4 to any of the 10 available channels using the FM Channel FM Power Switch You may wish to use a different channel if there is already another hearing assistance system or operations by some other authorized radio service operating on 72 9 MHz in your area Receivers must also be set to the same frequency See page 20 for receiver tuning instructions Choose and Connect an Audio Source Plug the T4 s audio cable into either Line Out Record Out Tape Out or Auxiliary Out jack on your system amplifier If these outputs are already in use a simple Y cord can be used to make the connection Plug the other end of the audio cable into the T4 s Audio Input Jack on the rear panel If all line level outputs are in use the T4 s line out jack on the transmitter s rear panel can be used to feed other devices IMPORTANT If you choose to connect to 70 Volt Speaker line be certain to set the
4. to 16 Q or 70 Volt speaker lines If you choose to connect to 70 Volt Speaker line be certain to set the Audio Select switch correctly Severe damage will occur if you do not When making such connections it s very important to avoid creating ground loops Pin 1 of the 3 pin connector and the sleeve of the 1 4 jack are connected directly to the chassis Normally one of these would be connected to the common output terminal of the power amplifier connected to the speaker line But in most installations there cannot be an external connection from the common terminal of a power amplifier to ground To avoid this unacceptable situation use a connection scheme like those described in the section Avoiding Ground Loops Set the Audio Select Switch for Line input when connecting to 2 16 speakers Set the Audio Select Switch for 70 V when connecting to 25 V or 70 V speaker lines Speaker lines are most often equalized making them an inferior signal source Source signals should not be equalized AVOIDING GROUND Loops Sometimes the normal way of connecting a T4 transmitter to other audio equipment creates a ground loop If other ground conditions are favorable ground loops can often be eliminated by using the T4 s balanced input amplifier even on unbalanced sources and connecting a capacitor in series with the audio line shield to the transmitter s ground This method also maintains good RF shielding Determining the effectiveness of this meth
5. ATOR The RF Carrier On Indicator shows when the transmitter is actually transmitting PHONES JACK The Phones Jack monitors the processed as transmitted audio It accommodates standard professional headphones with a 1 4 inch Tip Ring Sleeve Stereo plug It can accept any other type of headphone or earphone including those with Tip Sleeve Mono plugs Earphones with 3 5 mm plugs can be used with a suitable adapter i e Radio Shack Part 274 367 Listening to this signal gives an accurate indication of the audio actually heard by users AUDIO SELECT SWITCH Input characteristics audio processing mode and input filter cutoff frequency are set by this DIP switch A chart of settings is shown in Figure 3 and on the top of the unit On and Off are labeled on the body of the DIP switches Figure 3 Audio Select Switch Settings SWITCH SETTINGS AUDIO CONFIG SWITCH 1 3 4 Switch 1 selects between Limit AUDIO PROCESSOR and Compress Modes Limit ON COMPRESS Switches 2 and 3 control the Hi Pass Filter HI PASS FILTER FLAT Switches 4 8 must be matched 3 dB AT 200 Hz to your audio input 8 dB AT 730 Hz AUDIO INPUT 2 3PIN C LI TRS PHONE MIC BAL UNBAL LINE MIC W SIMPLEX BAL UNBAL LINE See page 13 for plug wiring diagrams BAL UNBAL LINE BAL UNBAL LINE BAL UNBAL 70 V BAL UNBAL 70 V wv Williams Sound Helping People Hear F A
6. Audio Config switch correctly Severe damage will occur if you do not wv Williams Sound Helping People Hear F A Set the Audio Select DIP Switches Set the Audio Select switch for the type of source you re using If you have used the audio cable provided with the PPA 250 there is no need to change the factory set configuration If you have used a different type of cable see the T4 s top panel and pages 10 and 13 for the appropriate switch configurations and plug wiring diagrams See page 15 for Compress vs Limit adjustments Connect the Power Supply Plug the T4 s transformer into a standard 120 VAC outlet and connect the attached cable to the transmitter The cable connector has a retaining catch which must be installed toward the top of the transmitter as illustrated on the T4 s back panel The T4 will not operate if you install the cable upside down though no damage will result Neither the T4 nor its power supply are equipped with a power switch Because there is no wear out mechanism and power consumption is minimal continuous operation is not a problem Adjust the Audio Input Control Play a compact disc or other good audio source through the complete sound system at a level that is typical of normal operation Adjust the Audio Input control so that the Level Indicator O QB LED generally lights and the 6 OB LED lights occasionally Listen with the Receiver Install the batteries plug in the earphone an
7. FM Auditory Assistance Transmitter Williams Sound wv Frequency Synthesized Channe Selecable Audio Adjust Power ae e 9 Phones Audio Level 1208 6dB 0dB 60B oooe lo Ok Ok Tot RF Carrier Audio Level Indicators 4 LED array reads 12 6 0 and 6 dB RF Carrier On Indicator Green LED indicates transmitter RF is on Phones Jack 1 4 TRS Stereo jack Audio Input Model PPA T4 Auditory Assistance FM Transmitter wv e ipe Williams Sound Corp Minneapolis MN USA Bal Ur Barir 70V nd ben Line Out FM Channel Antena Power 24 VAC Audio Select R9 Bal bol EA mmm O 50 60 Hz 10VA To configure see chart on top Eem Ee 75 Ohms fr d Power Connections 3 pin Molex connector Input Levels Minimum Nominal Maximum Microphone 100 pV 1 mV 100 mV Bal or Unbal Line 10 mV 100 mV 10V Bal or Unbal or 70 V speaker line 2 3 V 23V 230 V IMPORTANT If you choose to connect to 70 Volt Speaker line be certain to set the Audio Config switch correctly Severe damage will occur if you do not AFC Range Sensitivity Squelch nput Overload Frequency Response Signal to Noise Ratio Receive Antenna Audio Output Output Connector Earphone ote 300 kHz 2 uV at 12 dB Sinad with squelch defeated Squelches at 10 uV for min 50 cB S N ratio 20 mV 100 10 kHz 3 dB 50 dB at 10 uV ntegral with earphone headphone cord 250 mW max at 16 Ohms 3 5 mm mini phone ja
8. In simple sound systems the best audio source is usually a Tape or Auxiliary output jack on the system s amplifier Set the Audio Select switch for the type of source you have See Figure 6 and plug in a suitable audio cable If those jacks are already in use a simple Y cord can easily make the connection See Figure 5 for use of the PPA 250 s audio cable ENGINEERED INSTALLATIONS In an engineered audio system use good wiring practice to properly connect the audio feed as you would connect any other piece of high quality audio equipment See the section Avoiding Ground Loops and Choosing A Good Audio Source MULTI CHANNEL SOURCES By constructing a simple resistive mixer stereo or 3 channel sources can be connected to the T4 Additional channels can be accommodated by adding a resistor for each source Necessary resistors can be obtained from Williams Sound Part Number RFC 472 or from any local electronics parts supplier See Figure 6 FIGURE 6 AUDIO SOURCE CONNECTIONS From Moronone In Phase 3PinConnector 77 o gt SEEEESES N Low Impedance Microphone Balanced Line Using 1 4 Connector In Phase In Phase Unbalanced Line Using 1 4 Connector Source A 3 Pin Connector Source B Unbalanced Line Using 3 Pin Connector Connecting To A Stereo Source wv Williams Sound 13 Helping People Hear F A 2 TO 16 Q OR 70 V SPEAKER LINE The T4 input can also be connected directly to 2
9. Under FCC rules governing hearing assistance you must yield to them A list of cities where other radio services are known to exist is included with the transmitter Do not use frequencies that are known to be used by licensed radio services in your city either if they are on the list or if you discover one Figure 9 FM Channel FM Power Switch Settings SWITCH SETTINGS RF CONFIG SWITCH Switches 1 5 toggles control FREQUENCY frequency settings 72 100 MH 72 300 MH 72 500 MH 72 700 MH 72 900 MH Switches 7 and 8 control RF output 74 700 MH power The factory setting is FULL and 75 300 MH can be adjusted if conditions warrant 75 500 MH See Troubleshooting Guide 75 700 MH 75 900 MH Remember If you change the RF OUTPUT POWER transmitter frequency you must also FULL change receiver frequencies HALF On and Off are labeled on the QUARTER body of the DIP switches Switch 6 is not used wv Williams Sound 21 Helping People Hear W RECEIVER FREQUENCY CHANGE INSTRUCTIONS FiGure 10 R7 RECEIVER TUNING Tuning Coil This is a small square bright metal can with a screwdriver slot in the top center Using a plastic tuning tool PLT 005 rotate the Tuning Coil slowly and gently Do not press down on the adjustment When you find the signal transmitted by your system adjust for the loudest and clearest sound possible
10. W Installation Guide amp User Manual PERSONAL PA Pro Wide band System 250 Wireless FM Listening System Receiver Models R7 R7 4 MAN 071 D Transmitter Model T4 X4 Williams Sound 6 eiping reopie near F A PRO WIDE BAND SvsrEM Moner PPA 250 INSTALLATION GUIDE amp USER MANUAL Contents Page FAST SET UP PROCEDURE 4 SYSTEM OVERVIEW 6 CONTROLS AND CONNECTORS 8 DETAILED SET UP PROCEDURE 4 MOUNTING THE TRANSMITTER INSTALLING THE ANTENNA CHOOSING A CHANNEL CHOOSING AND CONNECTING AN AUDIO SOURCE CHOOSING AN AUDIO SOURCE FOR THE HEARING IMPAIRED CONNECTING THE POWER SUPPLY ADJUSTING THE AUDIO INPUT CONTROL AUDIO PROCESSOR OPTIONS 16 ASSURING EXCELLENT PERFORMANCE 17 RECEIVER USE INSTRUCTIONS 18 BATTERY INFORMATION 19 RADIO INTERFERENCE TUNING INSTRUCTIONS 20 SUGGESTIONS FOR RECEIVER MANAGEMENT 21 TROUBLE SHOOTING GUIDE 22 WARRANTY 25 SYSTEM SPECIFICATIONS 26 wv Williams Sound 3 Helping People Hear F A FAST SETUP PROCEDURE Choose a Location for the Transmitter It s usually most convenient to locate the T4 next to the public address equipment The location must have the audio feed and 120 VAC power available Place the transmitter on a level surface where there are no substantial metal or other electrically conductive objects between the antenna and the listening area After initial adjustments there should be no need to access the unit Choose a Location and Install the Antenna The
11. battery compartment using a coin in the slot in the bottom of the receiver Press the battery into place observing proper battery polarity Incorrect insertion of the battery is difficult and may cause both mechanical and electrical damage to the receiver not covered by the 5 year warranty The receiver will not work with the battery incorrectly installed CONNECTING EARPHONES Plug an earphone into the jack near the thumb wheel volume control Only monophonic earphones will operate properly If stereo headphones are used sound will be heard only in one side A suitable adapter Radio Shack Part 274 368 can be used so that stereo earphones operate on both sides Williams Sound extensively evaluates the earphones and headphones included with the PPA 250 We can only assure optimum performance when Williams sound earphones and headphones are used OPERATING THE RECEIVER Turn the receiver on by rotating the volume control in the direction of the arrow on top of the case The On indicator will light Turning the knob in the direction of the arrow will increase the volume Turning the knob against the arrow will decrease the volume To avoid depleting the battery make sure the receiver is turned off when not in use If you re using the PPA 250 with an existing sound system make sure the sound system is turned on Have someone speak into a sound system microphone while you listen with the receiver and earphone You should be able to hear the
12. ck also serves as a charging jack for rechargeable battery Earbud type with foam cushion 3 5 mm plug 32 Q The R7 Receiver can be field tuned to any of O wideband channels using the PLT 005 Tuning Tool Note FCC Rules limit the use of the 72 79 MHz band to hearing assistance for the handicapped only Your Authorized Williams Sound Dealer Is Williams Sound Corp Vi 10399 West 70th St Eden Prairie MN 55344 3459 U S A 800 328 6190 952 943 2252 FAX 952 943 2174 www williamssound com 2000 Williams Sound Corp MAN 071 D
13. d walk around the listening area The signal should be clear and quite loud when the volume is turned up See page 17 for performance checks For more detailed installation procedures see page 11 For more detailed system description see page 8 wv Williams Sound 5 Helping People Hear F A SYSTEM OVERVIEW The PPA 250 is a Wide band FM Listening System which operates in the 72 76 MHz frequency band Developed for hearing assistance in places of public access the PPA 250 is designed for those who need help overcoming background noise reverberation or distance from the sound source It includes a complete audio processor optimized for the needs of hearing impaired persons and is easily integrated with your existing sound system The PPA 250 can also be used with a microphone as a stand alone system Your PPA 250 has two principal parts the T4 Transmitter and the R7 Receivers Much like a miniature radio station the transmitter and microphone pick up the sounds you want to hear and broadcast them over an FM radio signal The receivers pick up the broadcast up to 500 feet away Listeners may sit anywhere and can make the audio signal as loud as they wish without causing PA system feedback or disturbing others To avoid difficulties read through this manual as you begin to use the system Then save it for questions that arise as you continue to use your PPA system If you have any problems with this Williams Sound product don
14. d with a setting of 2 or even lower If you have normal hearing a volume control setting of 3 will likely be too loud for comfortable listening There should be no audible distortion hum or noise Williams Sound wide band FM systems transmit audio using the same technical standards as FM Broadcast radio Therefore the received sound should be of high quality Using a suitable adapter Radio Shack Part 4274 361 you can connect a professional headphone to a receiver for a critical evaluation Step 2 Pause or stop the CD There should be no significant increase in noise or hum immediately after the sound is stopped Step 3 Play the CD again Listen to the system using a receiver Check for coverage in the listening area Walk through and around the entire audience area The sound in the receiver should remain clear and noise free within the audience area Some small spots in the listening area will seem to dropout getting no signal This is normal and is caused by RF signal reflections from relatively large electrically conductive objects In most installations the areas of reduced reception are less than one foot wide and few in number Moving the receiver only a few inches usually restores reception wv Williams Sound 17 Helping People Hear F A RECEIVER USE INSTRUCTIONS RECEIVER MobEL PPA R7 Receiver Model PPA R7 has a single wheel type volume control and an earphone output jack BATTERY INSTALLATION Open the
15. e worn behind the ear right next to telecoil equipped hearing aids Direct Aupio Input DAI Corp Direct Audio Input cords can be used with compatible hearing aids as well as with Cochlear Implant Processors wv Williams Sound I Helping People Hear F A BATTERY NFORMATION DISPOSABLE BATTERIES In normal use a heavy duty 9 Volt battery such as the Eveready 216 will last about 10 hours Alkaline batteries such as the Eveready 522 will provide about 32 hours of use If the sound becomes weak or distorted replace the battery The indicator light may still be on even with a battery that is weak Do not leave dead batteries in the receivers Battery corrosion is not covered by the Williams Sound five year warranty RECHARGEABLE BATTERIES The R7 can also use 6 or 7 cell nickel cadmium rechargeable batteries Optimal battery life is achieved with 7 cell batteries such as the Williams Sound BAT 003 6 cell batteries are usually marked 7 2 V 7 cell batteries are marked 8 4 V A fully charged 7 cell battery such as the BAT 003 will provide about 6 hours of operation per charge Damage from improper charging is not covered by the Williams Sound five year warranty The battery installed in the receiver may be recharged in the receiver only if it is a Nickel Cadmium battery and only if the correct Williams Sound charger is used Recharge batteries only with a Williams Sound BAT 005 Single Charger or a Williams Sound CHG 1269A Mul
16. g audio equipment Figure 4 FM Channel Switch Settings SWITCH SETTINGS Switches 1 5 toggles control RF CONFIG SWITCH 2 frequency settings FREQUENCY 72 100 MHz ON 72 300 MHz ON 72 500 MHz OFF 72 700 MHz OFF Switches 7 and 8 control RF output 72 900 MHz ON power The factory setting is FULL and 74 700 MHz ON can be adjusted if conditions warrant 75 300 MHz ON See Troubleshooting Guide 75 500 MHz ON 75 700 MHz Remember If you change the 75 900 MHz transmitter frequency you must also change receiver frequencies Switch 6 is not used RF OUTPUT POWER FULL HALF QUARTER OFF Power IN 21 VAC to 26 VAC only 50 or 60 Hz TFP 016 Power Supply included with system Current consumption is approximately 200 mA One side of power input is connected directly to circuit common Chassis 10 wv Williams Sound Helping People Hear F A DETAILED SETUP PROCEDURE Step 1 STEP 2 CHOOSE A LOCATION AND INSTALL THE TRANSMITTER It s usually most convenient to locate the T4 next to the public address equipment because your transmitter location must have the audio feed and 120 VAC power available FOR SIMPLE INSTALLATIONS Place the transmitter on a level surface where there are no substantial metal or other electrically conductive objects between the antenna and the listening area After initial adjustments there will be no need
17. icantly reduced both for soft and for loud sounds Compression is especially useful for these individuals In some situations however such as concerts compression is annoying to listeners especially musical purists Limiting provides control of the modulation level and is optimized to cause a minimum of disturbance to the sound It s acceptable to the most discerning listeners but not as helpful to hearing impaired people as compression Ficure 8 T4 AUDIO PROCESSOR PERFORMANCE Hard Limiter Always Functional Compress Liu LLLLL LLLI uul T3 31 LAdLNO 3AILV133 T LLLLLI 2S Audio 12 dB Light ON d Audio D dB Light OI obit nada una Lond cun biu cd bcn ru Lou 30 20 10 0 10 E RELATIVE INPUT LEVEL N wv Williams Sound 15 Helping People Hear F A Step 5 CONNECT THE POWER SUPPLY The T4 transmitter is powered by a wall mounted transformer supplying 24 VAC Plug the transformer into a suitable 120 VAC outlet and connect the attached cable to the transmitter The cable connector has a retaining catch which must be installed toward the top of the transmitter as shown on the T4 s back panel Though no damage will result the T4 will not operate if you install the cable upside down Neither the T4 nor its power supply are equipped with a power switch Because there is no wear out mechanism and power consumption is minimal continuous operation
18. ine Output FM Channel Switch Antenna Outputs Eight section DIP switch Combination 3 pin XLR 1 4 TRS jack RCA jack 0 6 V output impedance 1000 Q Eight section DIP switch Seven used Hard wired 75 Q Coaxial Antenna ANT 005 uses RG 59 cable 400 ft 122 m max cable length PERSONAL PA Receiver Model PPA R7 Dimensions amp Weight Color Battery Type Battery Drain Battery Life FCC ID Operating Freq Intermediate Freq FM Deviation De Emphasis 3 5 8 L x 2 3 8 W x 7 8 H 92 1 mm x 60 3 mm x 22 2 mm 3 2 oz 90 g with battery Gray 9 Volt Eveready 216 Carbon Zinc Eveready 522 Alkaline or BAT 003 Ni Cad 14 mA nominal 10 hours with Eveready 216 32 hours with Eveready 522 6 hours charge with BAT 003 CNM R7Y Pre Tuned Adjustable 72 MHz 76 MHz 70 kHz 75 kHz 75 uS Frequency Accuracy Deviation Pre Emphasis RF Field Strength Nominal Range Audio Proc Functions Compression Soft Limiting Frequency Response Signal to Noise Ratio Note 005 stability 0 50 C x 75 kHz maximum 75 usec Does not exceed 8 mV m at 3 m 300 500 ft 90 150 m Soft Knee Limit or Compress 10 dB add l gain when input is 20 dB 20 dB add gain when input is 40 dB gt 10 dB add l gain when input is 45 dB 30 16000 Hz 1 3 dB More than 70 dB below 75 kHz deviation in Limit mode Maximum transmitter range is achieved using the ANT 005 coaxial antenna PPA T4 Professional
19. installed in conduit with other Class II wiring It SHOULD NOT be installed with Class I power wiring gt Even though regulations allow the feedline to be installed with other audio system wiring you might still choose not to do this Because all coaxial cable leaks to some degree other improperly shielded audio equipment might be interfered with In these cases either avoid such installation or take steps as outlined in Williams Sound s Technical Bulletin Buzz Or Hum In The Sound System FRM 531 Other audio equipment will not disturb the transmitter or its antenna gt Do not connect the coaxial cable to the building or electrical ground in any way wv Williams Sound hi Helping People Hear F A AVOIDING UNDESIRABLE ANTENNA INSTALLATIONS Transmission range directional properties can be severely impaired by improper installation of the antenna gt DO NOT install the antenna within any metal enclosure gt DONOT install the antenna where it is within about 4 feet of any metal object that is more than about 2 feet long gt DO NOT install the antenna where it is separated from the listening area by any substantial metal object such as heating ducts structural steel foil backed insulation steel studs or metal lath gt DO NOT install the antenna with its elements horizontal It is a technical advantage to use vertical polarization as well as an FCC requirement SrEP 3 CHOOSE A CHANNEL Normally the T4 s fact
20. ir voice through the receiver If you re using the PPA 250 with a microphone and not a complete sound system have someone speak into the microphone while you listen with the receiver and earphone You should be able to hear their voice through the receiver Note The earphone cord is the receiving antenna Do not bunch up the cord or wrap it around the receiver ADDITIONAL RECEIVER INSTRUCTIONS Mobets PPA R7 4 AND PPA R7 6 The R7 4 and R7 6 receivers feature a channel selector knob on top of the receiver Turn the selector knob until you hear the desired program Moner PFM R16 The R16 Receiver features an environmental microphone input and dual volume controls The taller knob turns the receiver on and off and controls the transmitted signal level The wv Williams Sound Helping People Hear F A shorter knob controls the microphone signal level By adjusting the two volume controls you can hear a mixture of the transmitted signal and nearby sounds Note Some users may not be helped by this system Severe hearing loss may require using the system with a telecoil coupler i e Neckloop and personal hearing aid UsiNG A RECEIVER WITH A HEARING AID Williams Sound PPA Receivers can be used with hearing aids using three different methods NECKLOOP TELECOIL COUPLER Neckloops are cords which hang around the neck and couple magnetically with T Coil equipped hearing aids SILHOUETTE TELECOIL COUPLER These telecoil couplers ar
21. is not a problem If you want to control power to the transmitter connect the power transformer to a switched 120 VAC supply or a master switched outlet for the entire sound system Step 6 ADJUST THE AUDIO INPUT CONTROL Play a compact disc or other quality audio source through the complete sound system at a level that is typical of normal operation Adjust the Audio Input control so that the Level Indicator O dB LED generally lights and the 6 QB LED lights occasionally 16 wv Williams Sound Helping People Hear F A ASSURING EXCELLENT PERFORMANCE The PPA 250 consists of a transmitter and several receivers used to deliver an audio signal to listeners who are hard of hearing The audio signal is usually provided by equipment manufactured and installed by others The PPA 250 provides excellent audio performance under most conditions However Williams Sound equipment does not correct faults in incoming audio This section is intended to help installers and users recognize proper operation and correct faults whenever possible The following tests can be done without instruments to assure that a system is working properly How To RECOGNIZE PROPER OPERATION Step 1 Play a compact disc through the complete sound system at a level that is typical of normal operation Listen to the hearing assistance system using a receiver with a factory supplied earphone Set the volume on the receiver at about 3 Comfortable listening is usually achieve
22. lect switch is set incorrectly Set Audio Select switch to match your audio source and or readjust the source wv Williams Sound Helping People Hear F A NOISE IN AUDIO GROWS WHEN PROGRAM IS SILENT The Audio Level control is set too high You re probably also seeing the 6 level indicator lighting all the time To correct adjust the Audio Level control gt It could be that the T4 s Audio Processor is set for Compress when Limit might be more appropriate for the type of program being transmitted Reset the Audio Select switch for Limit See page 15 RECEPTION AT RECEIVER DIFFICULTIES Check Audio Difficulties as heard in phones jack on transmitter before checking reception No RECEPTION gt If the the T4 s RF Indicator LED is not on it s possible that an invalid channel is set on the FM Channel FM Power Switch Reset this switch to a valid channel gt Check to see if the antenna has been disconnected If so attach the antenna correctly gt Check to see if the output power is set to OFF If so reset the FM Channel FM Power Switch for FULL HALF or QUARTER RF output INSUFFICIENT RANGE GOOD RECEPTION NEAR TRANSMITTER POOR AT A DISTANCE gt Check to see if the transmitting antenna was installed incorrectly If so correct or replace the antenna The signal should be clearly audible at a 300 foot distance with the ANT 021 and a 500 foot distance with the ANT 005 Make sure the transmitting ante
23. nna is not in an unsuitable location Perhaps the transmitting antenna was installed inside a metal enclosure or is separated from the reception area by electrically conducting objects i e steel stud walls heating ducts substantial structural steel or 2x2 or 2x4 ceiling grid In either case reinstall the antenna according to installation instructions locating it outside metal enclosures and away from electrically conducting objects p gt Perhaps there is a strong interfering signal If so make sure the transmitter and antenna are correctly installed Set the transmitter to FULL power output If this does not solve the problem change the PPA 250 s frequency by setting the FM Channel FM Power Switch according to the instructions on page 24 0 DROPOUTS AREAS OF NO RECEPTION WITHIN NORMAL RECEPTION AREA p gt If dropout areas are few and less than 2 feet across there is no problem This is part of normal operation p gt If dropouts are many and large see the section on insufficient range above POPS OR SIMILAR LARGE DEFECTS IN RECEIVED AUDIO gt Check to see if there is defective audio at the transmitter If so See the Audio Difficulties section gt Check to see if the receivers are incorrectly tuned If so adjust receiver according to instructions on page 20 wv Williams Sound 25 Helping People Hear F A 26 Check to see if there is a strong interfering signal by listening to the receiver with the transmitter tu
24. od for your installation usually requires experimentation See Figure 7 FicunE 7 AVOIDING GROUND Loops 3 01 uF Ceramic 01 uF Ceramic M 1 Disc Capacitor 1 TE Disc Capacitor 3 Pin Connector Breaking A Ground Loop when Breaking A Ground Loop when Connecting to an Unbalanced Line Connecting to an Balanced Line CHoosiNG A GooD Aupio Source For THE HEARING IMPAIRED In engineered sound systems the designer can specifically provide an advantageous mix for the hearing impaired Here is a list of attributes that improve the installation s usefulness gt The audio should be dry with minimal reverberation either natural or artificially generated gt The signal should be flat with no equalization as might be found in the feed for house speaker amplifiers Connect the transmitter s input ahead of any equalizers However equalization provided by the parametric equalizers on each input channel of a console can be helpful gt The audio should not be subject to a compressor limiter or other signal processing equipment The transmitter has an effective audio processor Additional compression is wv Williams Sound Helping People Hear F A not helpful to the hearing impaired and can contribute to excessive noise in the receiver outputs See the section below Deciding Between Compress Or Limit Settings Ifan audio delay is available for use in large auditoriums it s usually best to use it Becau
25. of the 1 4 jack or to pin 3 of the XLR connector The shield is connected to the sleeve of the 1 4 jack or to pin 1 of the XLR connector The input impedance is approximately 20 KQ and performance is improved with a low source impedance With most professional audio equipment connecting the input directly to a line level output is best UNBALANCED LINE Any unbalanced line level source can be connected to the 1 4 jack or the 3 pin XLR input The Audio Select switch must be set properly The hot conductor is connected to the Tip of the 1 4 jack or to pin 2 of the XLR connector The shield is connected to the sleeve of the 1 4 jack or to pins 1 and 3 of the XLR connector If a Tip Ring Sleeve 1 4 jack is used the Ring must be connected to the Sleeve Input impedance is approximately 20 KQ Performance is improved with a low source impedance With most professional audio equipment connecting the input directly to a line level output is best 2 TO 16 Q OR 70 V SPEAKER LINE The T4 input can also be connected directly to 2 to 16 Q or 70 Volt speaker lines IMPORTANT If you choose to connect to 70 Volt Speaker line be certain to set the Audio Select switch correctly Severe damage will occur if you do not When making such connections it s very important to avoid creating ground loops Pin 1 of the 3 pin connector and the sleeve of the 1 4 jack are connected directly to the chassis Normally one of these would be connected to the common o
26. ory set channel 72 9 MHz requires no change However it may prove necessary to use an alternate channel if another hearing assistance system or authorized radio service is operating on 72 9 MHz in your area In this case you may easily set the T4 Transmitter to any of the 10 available channels using the FM Channel Power Switch Remember receivers must also be set to the same frequency See page 20 for receiver tuning instructions IMPORTANT Some cities have other radio services licensed on hearing assistance channels and under FCC rules governing hearing assistance you must yield to them A list is included with the transmitter of cities where other radio services are known to exist Do not use frequencies that are known to be used by licensed radio services in your city either if they are on the list or if you discover one NOTE If you seem to be having interference problems the best course of action is to first work through the Trouble Shooting Guide in case the problem is not caused by interference Try retuning if the problem remains FicunE 5 USING THE AUDIO CABLE SUPPLIED FOR UNBALANCED CONNECTIONS E 4 D ari Db To T4 Audio Input Amplifier s Line Output RCA to RCA Cable RCA to 1 4 Adapter 12 wv Williams Sound Helping People Hear F A Step 4 CHOOSE AND CONNECT AN AUDIO SOURCE Your choice of audio source can greatly affect the usefulness of your hearing assistance system SIMPLE INSTALLATIONS
27. our audio source Check and correct your audio source if necessary gt Check to see if the Audio Level control has been turned all the way down If so adjust it gt Check to see if there is an incorrect or defective connection from your audio source See page 13 14 for detailed connection instructions Noise IN AUDIO gt Check to see if there is noise in source audio To find out disconnect the audio cable If the noise disappears you noise problem is in the source Correct or repair your audio source gt Check to see if your source level is too low If so readjust your source audio level or reset Audio Select switch to match the existing source level Buzz OR HUM IN AUDIO Check to see if the buzz or hum in in the source If so correct or repair your audio source gt Check to see if there is an incorrect or defective connection from source If so correct your connections See page 13 14 for detailed instructions DISTORTED AUDIO Check to see if the source audio is distorted source If so correct or repair your audio source gt Perhaps the Audio Select switch is not set to match your audio source If this is the case reset the Audio Select switch to match and or readjust the source Check to see if the Audio Level control is set too high If the 6 level indicator is on all the time adjust the Level control counter clockwise p gt Ifthe Audio Level control is set near fully counter clockwise the Audio Se
28. rned off If an interfering signal is causing overload in the receivers see the section on insufficient range above If changing channels does not remedy the problem use other technology such as Williams Sound Narrow Band FM or Williams Sound Infrared USERS MUST TURN RECEIVER VOLUME CONTROLS WAY UP TO 4 OR 5 TO GET ENOUGH VOLUME p gt Perhaps there is insufficient audio level If so the audio level indicator will read too low because the audio level is set incorrectly on the transmitter Correct the Audio Level control setting gt It could be that the input is not configured for the audio source used If not correct the setting of the Audio Select switch gt Some users may not be helped by this system Severe hearing loss may require using the system with a telecoil coupler i e Neckloop and personal hearing aid USERS COMPLAIN OF NOT HEARING LOW LEVEL SOUNDS gt Check to see if the Audio Level is set too low If so adjust the Audio Level carefully noting the Level Indicator The 6 LED should light occasionally gt Check to see if the transmitter is set for Limit when the program material would benefit from Compress mode If so set the Audio Select switch for Compress USERS COMPLAIN OF TOO MUCH NOISE DURING SOFT AUDIO DYNAMIC RANGE OF MUSIC REDUCED TOO GREATLY Check to see if the Audio Level control is set too high This problem is more likely to occur in Compress Mode but can also occur in Limit Mode To reduce
29. s Sound T4 Transmitter and R7 R7 4 R7 6 and R16 Receivers are warranted against defects in workmanship and materials for FIVE YEARS Microphones earphones cables carry cases rechargeable batteries and chargers are warranted against defects in workmanship and materials for NINETY DAYS This warranty does not extend to intentional or accidental physical damage This warranty applies only to products returned to Williams Sound for service To return a product for service call 1 800 843 3544 and request a Return Authorization RA number wv Williams Sound 27 Helping People Hear F A Pro Wide band System Model PPA 250 SPECIFICATIONS PERSONAL PA Transmitter Model T4 Dimensions Weight Color Rack Mount Power FCC ID Operating Freqs 8 45 21 5 cm W x 8 18 20 8 cm D x 1 72 4 4 cm H 3lbs 1 5 kg Black epoxy paint with white legends One EIA rack space high 1 2 space wide 1 2 units can be mounted in a single rack space with optional RPK 005 single or RPK 006 double Rack Mount Kits 21 VAC minimum 26 VAC maximum 50 or 60 Hz 4 8 VA nominal 10 VA maximum Wall mount transformer for 105 to 130 VAC included CNMT4 72 1 75 9 MHz 10 wide band channels selectable TA Transmitter Front Panel Power Indicator Audio Level Control Green LED Rotary pot screwdriver adjust used with audio level indicator lights TA Transmitter Rear Panel Audio Select Switch Audio Input L
30. se radio signals travel faster than sound delaying the transmitted audio so that an average listener in the middle of the listening area hears the transmitted audio a few milliseconds after audio from the main sound reinforcement system speaker is helpful This will also help audience members who lip read gt The FM hearing assistance system transmits audio with very good fidelity using the same technical standards as commercial FM broadcast radio Its quality is usually limited by the audio source and by the earphones used with the receivers Therefore the audio source signal should be of the highest quality possible DECIDING BETWEEN Compress OR LIMIT SETTINGS It s easy to select Compress or Limit using one position of the Audio Select Switch When choosing which mode to use the system operator should consider the expected audience and program material Figure 8 shows response curves for the compressor limiter circuitry A hearing impaired person s perception of what is too loud is usually similar to a normal hearing person s However they often don t hear soft sounds as well In other words their dynamic range is reduced To compensate the T4 s Audio Processor can compress the audio signal reducing the dynamic range and making it more useful to the hearing impaired Some hearing impaired people cannot tolerate as loud a sound as those with normal hearing When accompanied with hearing loss their dynamic range is signif
31. this noise adjust the Audio Level carefully noting the Level Indicator The 6 LED should light occasionally p gt Perhaps the transmitter is set for Compress when Limit Mode would be more suitable given the program material If so set the Audio Select switch for Limit Buzz IN OTHER EQUIPMENT WHEN TRANSMITTER IS ON OR OFF gt This is not an RF problem Instead it is likely caused by incorrect audio connections a ground loop or defective equipment To remedy use proper audio wiring practice to make connections described on page 14 Buzz OR OTHER NOISE IN EQUIPMENT ONLY WHEN TRANSMITTER IS ON This is likely an RF induced disturbance in the other equipment To remedy try these steps in order until the buzz is eliminated 1 Make certain the transmitter chassis is connected to the equipment cabinet rails 2 Make sure antenna connections are secure 3 Setthe T4 Transmitter to HALF or QUARTER power output using the FM Channel FM Power Switch 4 Install transmitter at a distance from sensitive equipment 5 Usearemote antenna ANT 005 or ANT 024 6 Make sensitive equipment more immune to RFI EMI The manufacturers of your wv Williams Sound Helping People Hear F A audio equipment may offer application notes for this purpose Williams Sound offers a document giving suggestions for improving RF immunity in existing audio equipment Technical Bulletin Buzz Or Hum In The Sound System FRM 531 WARRANTY The William
32. tiple Charger The charger is connected to the receiver through the EAR jack Make sure the receiver is turned off during charging A complete recharge cycle takes about 14 hours Receivers should not be left charging continuously when not in use I IMPORTANT WARNINGS DO NOT ATTEMPT TO RECHARGE ZINC CARBON HEAVY DUTY ALKALINE OR LITHIUM BATTERIES DO NOT ATTEMPT TO RECHARGE DISPOSABLE BATTERIES These batteries may heat up and explode causing possible injury and damage to the equipment Avoid shorting the plus and minus battery terminals together with metal objects Battery damage and burns can result Use only Williams Sound Supplied chargers and batteries 20 wv Williams Sound Helping People Hear F A FREQUENCY CHANGE INSTRUCTIONS Normally the PPA 250 s factory set channel usually 72 9 MHz requires no change However if another hearing assistance system or authorized radio service is operating on 72 9 MHz in your area it may prove necessary to use an alternate channel In this event the PPA System 250 s operating frequency can easily be changed to an alternate channel to avoid interference See the following sections for instructions on changing frequencies TRANSMITTER FREQUENCY CHANGE PROCEDURE Set the T4 Transmitter to any of the 10 available channels using the FM Channel FM Power Switch See figure 9 IMPORTANT Some cities have other radio services licensed on hearing assistance channels
33. to access the unit For ENGINEERED INSTALLATIONS The transmitter can be mounted in an equipment rack Use a Williams Sound rack mount kit RPK 005 or RPK 006 Make sure there is good electrical contact between the transmitter chassis and the rack cabinet Ambient temperature of the transmitter location must not exceed 125 F CHOOSE A LOCATION AND INSTALL THE ANTENNA The T4 is equipped with a with a short flexible antenna ANT 021 The ANT 021 threads onto a stud recessed in a hole on the top of the transmitter Do not use excessive force to tighten the antenna it need only be finger tight The T4 can also be purchased with a coaxial antenna ANT 005 or Wall Mount Dipole Antenna ANT 024 REMOTE ANTENNA LOCATION TIPS Install the ANT 005 or ANT 024 with its elements vertical It should be near or within the listening area and somewhat above the seats However do not install the antenna directly overhead There is a null in the coverage area off the ends of the antenna gt The antenna is best installed on a wall 10 to 15 feet above the floor It may be located in the next room from the listening area if the separating wall does not contain metal lath steel studs or significant ductwork Do not install the antenna in an organ chamber The numerous pipes of an organ significantly deflect and absorb the radio signal The ANT 005 and ANT 024 feedline is classified under the National Electrical Code as Class II wiring and may be
34. tory Assistance FM Transmitter A Williams Sound Corp Minneapolis MN USA XLR Bal Mic Bal Unbal line or 70V Antenna Cm Line Ou FM Channel Power 24 VAC Audio Select TRS Bal Unbal Power 50 60 Hz 10VA Line or 70V aver Fes dcs 12345678 12345678 fC To configure see i See chart on top 75 Ohms Balanced Unbalanced Audio Input FM Channel FM Power Switches Power Combination 3 pin female XLR 1 4 stereo jack accepts DIP switch for setting channel frequency and Connection balanced or unbalanced microphone and line level inputs RF output power level See chart on top of 3 pin Molex 25 V or 70 V audio input unit for switch configurations connector for TFP 016 power supply IMPORTANT If you choose to connect to 70 Volt Speaker line be certain to set the Audio Config switch correctly Severe damage will occur if you do not wv Williams Sound Helping People Hear F A CONTROLS AND CONNECTORS FRONT PANEL REAR PANEL POWER NDICATOR Indicates that the transmitter has power available and that the unit is on AUDIO ADJUST CONTROL Controls level of audio signal and is connected between the input amplifier and the audio level processing circuit AUDIO LEVEL INDICATOR A four LED array shows audio level in 6 dB steps Indicator is average responding and is calibrated so that optimum level is reached when the amber 0 light usually blinks and the red 6 light blinks occasionally RF CARRIER INDIC
35. utput terminal of the power amplifier connected to the speaker line But in most installations there cannot be an external connection from the common terminal of a power amplifier to ground To avoid this Williams Sound 4 Helping People Hear F A unacceptable situation use a connection scheme like those described in the section Avoiding Ground Loops Set the Audio Select Switch for Line input when connecting to 2 16 Q speakers Set the Audio Select Switch for 70 V when connecting to 25 V or 70 V speaker lines Speaker lines are most often equalized making them an inferior signal source Source signals should not be equalized TAPE OUTPUT A line level output of the fully processed as transmitted audio is provided through this jack Use it for monitoring audio quality providing a processed signal for recording or for other uses FM CHANNEL FM Power SWITCH The channel frequency and RF output power level are set according to a chart shown in Figure 4 as well as on the top of the unit On and Off are labeled on the body of the DIP switches 10 wide band FM frequencies are available Once the FM Channel FM Power Switch is set no further adjustment is required RF output can be reduced to alleviate problems caused by inadequate immunity to RF in some audio equipment Williams Sound offers a document Technical Bulletin Buzz Or Hum In The Sound System FRM 531 giving suggestions for improving RF immunity in existin
36. w frequency inside each s case for future reference wv Williams Sound Helping People Hear F A SUGGESTIONS FOR RECEIVER MANAGEMENT wv Different types of facilities use varying approaches to receiver management and earphone sanitation Below are some options that customers have used successfully 1 Williams Sound Helping People Hear Regular users purchase or are given their own receiver and take care of their own batteries and earphones The facility labels a receiver and earphone for each regular user The facility maintains the units Ushers issue receivers to people who request them Earphones are sanitized after use Foam ear cushions can be replaced or washed with a mild detergent rinsed thoroughly and air dried The EAR 022 Surround Earphone can be sanitized with an alcohol pad The receivers can be stored in a multiple compartment storage case with a credit card or driver s license left as collateral for the receiver Regular users purchase their own earphone or headphone and bring them to use with receivers at the facility 23 F A TROUBLE SHOOTING GUIDE NO TRANSMITTER OPERATION POWER LIGHT NOT ON gt Most likely there is no power Make sure the power outlet is working and that the PPA 250 s power supply TFP 016 is connected correctly AUDIO DIFFICULTIES AS HEARD IN PHONES JACK ON TRANSMITTER 24 No AUDIO HEARD IN PHONES JACK gt Check to see if there is a signal coming from y
37. wv INPUT The input can be configured to accept three types of signal sources Balanced or Unbalanced Microphone Balanced or Unbalanced Line and 70 V speaker line The input is configured to accept various combinations of these inputs by means of the Audio Select switch See Figure 3 PROFESSIONAL MICROPHONE Most dynamic ribbon or condenser microphones equipped with a balanced output and a 3 pin XLR connector can be used Power can be supplied for condenser microphones according to DIN 45596 It can be turned off for dynamic and ribbon mics though this is not usually required Microphones are connected in the normal industry standard pin arrangement The in phase signal conductor is connected to pin 2 the out of phase signal conductor is connected to pin 3 and the shield is connected to pin 1 of the XLR connector Optimum performance is attained with 200 Q microphones LOW COST MICROPHONE Most low cost dynamic or condenser with an internal battery microphones equipped with a two conductor 1 4 plug can be connected if an appropriate adapter is used A suitable adapter is Radio Shack part number 274 017 BALANCED LINE Any balanced line level source can be connected to the 1 4 jack or the 3 pin XLR input The Audio Select switch must be set properly The in phase signal conductor is connected to the Tip of the 1 4 jack or to pin 2 of the XLR connector The out of phase signal conductor is connected to the Ring
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